Lifetimes from many new measurements of \(b\) -flavored hadrons have been presented. We have a good picture of the \({\hspace{1.79993pt}\overline{\hspace{-1.79993pt}B}{}} {}^0_{s} \)  lifetime including the value for \(\Delta \Gamma _s\) .\(\endcsname \)The value for \(\tau ({{{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}B}{}} {}^0_{s}}})\)  can be improved upon by judiciously averaging the values from the different decay modes that are not expected to be affected by Penguin contributions.

The \({焃} ^0_{b} \)  lifetime is now measured precisely and is consistent with the original predictions of the Heavy Quark Expansion, contrary to early indications. In Fig. REF  I compare recent HQE predictions [1]} for the ratio of lifetimes with the measurements. The data is in good agreement with the theoretical predictions where they exist. Furthermore, except for the \(\tau _{B^-}/\tau _{{{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}B}{}} {}^0}}\)  ratio, all the measurements with respect to \(\tau _{{{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}B}{}} {}^0}}\)  are consistent with a value slightly smaller than one. The higher ratio for \(\tau _{B^-}/\tau _{{{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}B}{}} {}^0}}\)  is explained using Pauli interference. The \(\tau _{{{焃} ^0_{b}}}/\tau _{{{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}B}{}} {}^0}}\)  ratio is measured much better than the theoretical prediction, so more effort here can be used to improve the calculation. For all the calculations, the current inaccuracy in theory is dominated
by the unknown non-perturbative matrix elements, which could be determined by lattice calculations.
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